The thick PBT are different from the regular pbt.
The thick pbt adds a great deal of weight to the keys. They also rebound a little bit slower.
They're definitely NOT worth the price. but people around here are you know, a little crazy..
The regular pbt are the same thickness as the abs caps. the only difference is the "satin" texture on them do not wear out as quickly.
But, rest assure, they DO wear out. It's only a matter of time.
Shine looks ugly on "black" abs because it looks like a layer of oil on otherwise satin keys.
But if you have bright colored ABS, it looks fine, and is hardly noticeble.
I recommend the WASD abs caps for bright colors.
they do make White and black PBT, i don't recommend black keys in general, because they'll shine, EVENTUALLY, pbt or abs.
The white keys, you might choose to go with the PBT on ebay from feng. But take note, they're not printer paper white. They're shifted towards Blue and violet.
The abs keys from WASD are closer to printer paper white.